 English |
|
|
|
|
|
|
|
| SGM724_15 Datasheet, PDF (10/19 Pages) SG Micro Corp – CMOS Operational Amplifiers | |||
| |||
| ◁ |
SGM721/2/3/4
970μA, 10MHz, Rail-to-Rail I/O
CMOS Operational Amplifiers
TYPICAL APPLICATION CIRCUITS
Differential Amplifier
The circuit shown in Figure 4 performs the difference function. If
the resistor ratios are equal (R4/R3 = R2/R1), then VOUT = (VP - Vn)
à R2/R1 + VREF.
R2
R1
Vn
VP
R3
SGM721
R4
VREF
VOUT
Figure 4. Differential Amplifier
Low Pass Active Filter
The low pass filter shown in Figure 6 has a DC gain of (-R2/R1)
and the -3dB corner frequency is 1/2ï°R2C. Make sure the filter
bandwidth is within the bandwidth of the amplifier. The large
values of feedback resistors can couple with parasitic
capacitance and cause undesired effects such as ringing or
oscillation in high-speed amplifiers. Keep resistor values as low
as possible and consistent with output loading consideration.
R1
VIN
C
R2
SGM721
VOUT
Instrumentation Amplifier
The circuit in Figure 5 performs the same function as that in
Figure 4 but with a high input impedance.
R3=R1//R2
SGM721
Vn
Vp
SGM721
R2
R1
SGM721
R3
R4
VOUT
VREF
Figure 6. Low Pass Active Filter
Figure 5. Instrumentation Amplifier
SG Micro Corp
10
www.sg-micro.com
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese